Aoki Hagane no Arpeggio

Aoki Hagane no Arpeggio

Summary: Suddenly, a fleet of ships with mysterious super-weapons called the “Fleet of Fog” appeared all around the world. Humanity didn’t have the technology to fight such a fleet, so they were driven out of the sea...
Seventeen years after the battle, for some reason,
Gunzou Chihaya and his crewmates aboard the I-401
and the personification (Mental Model) of the I-401,
Iona, started fighting the Fleet of Fog...